Applying Directly Modified RDFT Method in Active Power Filter for the Power Quality Improvement of the Weak Power Grid

Abstract

The recursive discrete Fourier transformation (RDFT) method can be used for grid voltage phase-locking and harmonic current detection in a shunt active power filter (SAPF). However, in weak power grids such as microgrids, significant errors might occur in the amplitude and phase detection due to grid frequency deviation. In this study, to resolve this problem, a directly modified RDFT (DMRDFT) method is proposed for SAPF weak grid application. Through theoretical analysis, the errors of phase and amplitude detection were found to consist of fixed error and fluctuating error. The fixed error is only determined by frequency deviation, whereas the fluctuating error is also related to the recursive pointer and the initial phase. The DMRDFT algorithm can obtain the real grid frequency through the calculation of the phase angle difference for two consecutive periods. Then it can employ the grid frequency deviation and the recursive pointer value to directly correct the detection results gathered by the conventional RDFT algorithm. As a result, DMRDFT can yield accurate amplitude and phase information of the grid voltage or current with a simple calculation. Simulation results verify the high precision of the proposed DMRDFT method in both steady and dynamic situations. Experimental results show that the DMRDFT method can significantly increase the SAPF compensation performance when grid frequency shifts.

Review of Legal Aspects of Electrical Power Quality in Ship Systems in the Wake of the Novelisation and Implementation of IACS Rules and Requirement

“…Further, SI are particularly harmful power quality disturbances. They exert noxious impacts on various components of power systems, like synchronous generators, transformers, power electronic equipment and measurement and control systems [33,[37][38][39][40]. An energy receiver that is especially sensitive to SI is an induction motor.…”

Effects of Voltage Interharmonics on Cage Induction Motors

“…Interharmonics can disturb the work of power electronic equipment, measurement and control systems [20][21][22], induction motors [23], and light sources, including commonly applied LEDs [24]. At the same time, power quality standards generally do not provide limitations of interharmonics.…”

“…Undesirable phenomena due to the interharmonics' occurrence have been discussed in numerous works [20][21][22][23][24][26][27][28][29][30][31][32][33][34][35]. In [26][27][28][29][30], induction motors under voltage fluctuations were analysed.…”